I would think for the regular pooner getting the girl off is as important as getting themself off, well ok not as important but stil important... Part of the whole experience is mutual enjoyment, with out that one might as well stay home and do the wife... Atleast you know she can't wait for you to finish so she can go to sleep...
i think we all have had sex where you are thinking of something else... The hockey game, work, or the hottie you seen walking down the street, it is only natural...
For me, hearing the girl and seeing her enjoy herself is a big part of it, if I am not getting you there, speak up, tell me what you like, what works for you... Though, I am not 19 and kind of got an idea of what is working and what isn't